Does Motorola still make the MRF150 or has it been replaced/discontinued? Tried to find a source but internet search only returns bazillions of data sheet sources and the sources I found on ebay were either used or "reconditioned". I'd prefer to use new....

There are lots of brand new MRF150's available on Ebay. They come from distributors in China but I have bought many of them and have always had good results. I test all my MOSFETs before I install them and so far I have only found one defective one, which the distributor replaced at no cost. Typical pricing is around $29, a little less if you buy in quantity.

What is with MRF154 benefits over the Infineon`s DE series 150, 275, 375, 475? They keep the frequencies up to 100 MHz and thermal load until 1,8kW/piece, thus I see the MRF really benefits only between 100 and 400 MHz. Or something I missed from my eyesite?

Note that those are switching parts and not designed for linear service, note also that the 730W thermal rating of the DE475 is given at 25 degrees C case temperature and with a derating factor of 4W/C (The others are worse)......

For RF plasma generators and such in the 13.56Mhz ISM band (clearly what these are designed for) these are a solid choice, but I doubt you would get good performance in a linear amplifier.

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